SSD currently is the fastest this year. It was finally improved last year. SATA SSD drive currently is the fastest drive.
Check this link
SSD Solid State Disk Drives buy
bit-tech.net | SATA SDHC RAID spotted
The SSD read/write speed are much greater than hdd. It can read 150mbps to 250 mbps and write 100 to 150mpbs comparing to hdd averaging 50mbps to 65mpbs.
So that's something you might think about. Since it have changed for better last year, It's gonna replace many hdd very soon!!
Currently, I am waiting for the order from Hong Kong, It's a SDHC to 44 pin IDE adapter and I have ADATA Turbo Class 6 SDHC which can read at 22mbps and write 10mpbs. It may be slow but there are newer card coming on the way... Read below about SDXC which is a newest breed coming soon..
SDXC
The Secure Digital Extended Capacity (SDXC) format was unveiled at CES 2009. The maximum capacity defined for SDXC cards is 2 TB (2048 GB). SDHC cards also have a maximum capacity of 2 TB based on the card data structures, but this is arbitrarily limited to 32 GB by the SD 2.0 document.
The maximum transfer rate of SDXC was announced as 104 MB/s, with plans to increase it to 300 MB/s in the future. The SDXC specification has selected Microsoft's proprietary exFAT file system as the standard for this memory card format;[22][23][24] however, as with SDHC and SD, it is possible to use another filesystem such as FAT32 or ext2.
On January 8, 2009, Panasonic announced plans for production of 64 GB SDXC cards.[25]
On March, 6, 2009, Pretec introduces world's first SDXC card [26] with a capacity of 32 GB and a read/write speed of 50 MB/s. At the introduction there were no products compatible with the new memory card.
So If they have it in market right now, it would have been very expensive for 8gb. Soon in few year, it's gonna be cheap and computer would go fast and smooth with SDXC card.
Catty